So I've been looking all over the internet and it seems that carbon fiber is everywhere. From full frames to part of the frame to forks. I'm just curious, since it's been around for a while now does anyone have an opinion on how it compairs to steel in the durability department. The next bike I buy I would like to keep for as long as I want and not have to get rid of it becuase it has worn out or just broke. To me, steel and titanium are the way to go but I may have a chance at getting a new Trek carbon fiber for dirt cheap thus the reason I'm looking for input.

Thanks,
Bob